update doxs to use a Configurator context manager

Steve Piercy

2017-07-04 d91e5d4d5d0165a7f7599c84c988b981b5fd0d2d

 docs/narr/configuration.rst

@@ -47,9 +47,9 @@
       return Response('Hello world!')

   if __name__ == '__main__':
       config = Configurator()
       config.add_view(hello_world)
       app = config.make_wsgi_app()
       with Configurator() as config:
           config.add_view(hello_world)
           app = config.make_wsgi_app()
       server = make_server('0.0.0.0', 8080, app)
       server.serve_forever()

@@ -116,9 +116,9 @@
       return Response('Hello')

   if __name__ == '__main__':
       config = Configurator()
       config.scan()
       app = config.make_wsgi_app()
       with Configurator() as config:
           config.scan()
           app = config.make_wsgi_app()
       server = make_server('0.0.0.0', 8080, app)
       server.serve_forever()